Not over here

Get yourself onto Ebay.co.uk and you should find the proverbial haynes manual for a Vauxhall Vectra...same beast different badge.
If you need to ge deeper than that, try some of the UK based forums for vauxhalls...tons of knowledge out there.
You will find squat in the US, this vehicle never came here, and it's not the type to be a grey import.
HTH,
Rob.